function startCSS() {
  n = navigator;
  na = n.appVersion;
  nua = n.userAgent;

  isFirefox = ( nua.indexOf( 'Firefox' ) != -1 );

  if (isFirefox) {
    identity=document.getElementById('linksbinnenDiv');
    identity.className = 'linksbinnenFF';
    identity=document.getElementById('schermDiv');
    identity.className = 'schermFF';
    identity=document.getElementById('linksDiv');
    identity.className = 'linksFF';
    identity=document.getElementById('navL');
    identity.className = 'navlinksFF';
    identity=document.getElementById('popOnderDiv');
    identity.className = 'popOnderFF';
  }
}

function findPosX(obj)
{
	var curleft = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}
	else if (obj.x)
		curleft += obj.x;
	return curleft;
}

function findPosY(obj)
{
	var curtop = 0;
	if (obj.offsetParent)
	{
		while (obj.offsetParent)
		{
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}
	else if (obj.y)
		curtop += obj.y;
	return curtop;
}